Regulating device for engines



Jan. 19, 1932. JUNKERS 1,841,897

REGULATING DEVICE FOR ENGINES Filed Oct. 29. 1929 /nvenfo/ Patented Jan. 19 1932 UNITED STATES PATENT oFi-"lcE Application filed October 29, 1929, Serial No.

My invention relates to internal combustion engines and more especially to Diesel engines. It has particular reference to means for regulating the speed of such engines by regulating the supply of fuel to the cylinders. It is an object of my invention to provide means of the kind aforesaid, which are simpler in design and more eflicient than similar means hitherto devised.

Diesel engines serving for driving motor cars have hitherto been regulated by a device comprisin a throttling means in the suction conduit 01: the engine, this throttling means being adjusted by the driver, an automatically active regulating member influenced by the pressure in the suction conduit (for instance an oscillating piston), which acts on the fuel metering device (fuel pump), these two elements enabling the speed to be varied, and

a device for limiting, either at will or automatically, the stroke of the regulating member when changing over from a certain speed of the engine to another speed which greatly differs from the first one. The limiting of the regulating member stroke has for its purpose to avoid a sudden jerky change of the fuel supply to the highest possible quantity (when speeding the car up) or down to the smallest quantity (when pulling the car up), the extent of this change corresponding in each individual case to the extent and velocity of adjustment of. the throttling member.

My invention contemplates a gradual adjusting of the fuel metering device and a correspondingly smooth regulation of all kinds of engines, the speed of which is variable within wide limits, for instance also in carbureter engines. In engines of this latter type designed for motor vehicle drive an automatic regulating member (governor) has hitherto been distpensed with alto ether or in some cases a sa ety' governor has een provided which, while reducing the supply of fuel when the maximum number of revolutions per min. of the engine or the maximum speed of the vehicle was obtained, did not operate under normal conditions. I

This end can be obtained with the aid of a governor adjustable for different speeds,

i. e. a so called power governor, in combina- 403,259, and in Germany November a, 1928.

tion with a device which serves on the one hand for varying the speed of the engine during operation and on the other-hand also limits the stroke of the governor. This latter device may consist of a system of rods op.- erable by means of a handle or pedal lever and which acts on the governor spring, allowing its tension to be varied, while at the same time distplacing a check, which limits the stroke 0 the governor or of the regulating means controlled by the governor, for in stance the carbureter throttle.

The system of rods and the check may also be replaced by a devic combined with the governor, for varying t e degree of nomuniformity of the governor insuch way that it is greater at small than at great numbers of revolutions per minute, in order to obtain a smooth operation of the governor when changing over from lower to higher speeds. In the drawing afiixed to this specification and forming part thereof a system embodying my invention is illustrated diagrammatically in side elevation, partly in axial section by way of example.

Referring to the drawing, 1 is the engine to be regulated and 2 is a'centrifugal governor. The speed of the governor is at a'constant ratio to the speed of the engine. 3 is the governor sleeve and 4 is an angle lever eontrolled by this sleeve and actingon the rod 5 controlling the throttle 6, which is mounted in the suction conduit15 of the engine. 7 is the spring acting on'the sleeve of the governor, the outer .end of the spring abutting against an angle'lever 8. By operating this lever the tension of the spring and consequently also the speed of the engine which is heldconstant'by the governor can be varied. Tothis end lever 8 is connected by a rod 9 to the pedat lever 10,. which may of course be replaced by a hand lever. Another rod 11 connected with angle lever 8 is attached to a double-armed lever 12, the bottom end of which extends into the path of a check'14 mounted on the'rod 5 which leads to the throttle 6. i

- The operation of this device is as follows:

If by actuating the dal 10 angle lever 8 is turned into the positib n shown in dotted lines the tension of spring 7 is increased and in consequence thereof the governor tends to cause the engine 1 to run at a higher speed. In order to speed up the engine, the supply of fuel must be increased by opening the throttle 6 further. \Vhen operating lever 8, lever 12 has also been rocked to assume the position shown in dotted lines, in which its lower end 13 is spaced farther from the check 14. In an ordinary regulating device an adjustment of the governor for a higher speed would cause the governor to increase the fuel supply as much as possible by the shifting of the rod 5, whereby the throttle 6 would be opened as wide as possible. In the present case, however, check 14 meeting the lower end 13 of lever 12 will limit the movement of rod 5 and the opening movement of the throttle 6. Thus the range of regulation of the governor 2 is limited by the free end 13 of lever 12 and this limitation depends from the extent to which the pedal lever 10 has been rocked and from the velocity, at which the pedal lever has been displaced. Therefore, if the pedal lever is gradually depressed, the governor will not be able to suddenly and unduly speed up the engine.

The difference between this device and the well known governing system used in con nection with injection engines, in which a throttling member in the air suction conduit is directly adjusted, while the fuel metering device (pump) is indirectly influenced by the variation of pressure following such adjustment, consists therein, that in the present case the operating of the lever 10 causes the governor to be directly adjusted to maintain another speed of the engine, the adjusting of the throttle in the suction conduit taking place only indirectly by means of the governor, in other words, contrary to the conditions of operation in the known arrangement.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

In the claims afiixed to this specification no selection of any particular modification 9f the invention'is intended to the exclusion of other modifications thereof and the right to subsequently make claim to any modification not covered by these claims is expressly reserved.

I claim 1. Regulatingdeviceforenginescomprising a centrifugal governor, means for ad usting said governor during operation for varyin speeds, means for controlling the supply 0 fuel to the engine and means positively connected with the governor adjusting means for displacing a stop arranged to limit the regulating movement of said governor.

2. Regulatingdeviceforenginescomprising a centrifugal governor in operative conneo tion with the engine, a throttle controlling the supply of fuel to the engine, a positive connection between said governor and said throttle, means for adjusting said governor HUGO JUNKERS. 

